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set-off; offset; unwanted transfer of ink from a freshly printed sheet to an adjacent sheet in a pile
offset (printing process)
show-through; printing on one side of a sheet being visible from the other side
紙の裏うつりが気になった。
I was concerned about the paper showing through.
裏うつりを防ぐための対策だ。
It's a measure to prevent showing through.
裏うつりしないインクを使う。
I use ink that doesn't show through.